Rebel finding a new curved structure first (9)
I believe the answer is:
anarchist
'rebel' is the definition.
(thesaurus)
'a new curved structure first' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'curved structure' becomes 'arch' (architectural structure).
'first' becomes 'ist' (ist resembles 1st).
'a'+'n'+'arch'+'ist'='ANARCHIST'
'finding' acts as a link.
(Other definitions for anarchist that I've seen before include "disorder?" , "Anti-authoritarian" , "One opposing government" , "Who may have wanted to destroy" , "subversive character" .)